New Start, looking for information and advice.

[Antonius Insulae]

Hello, and welcome to the hobby!

I have some suggestions to give you.

Armour
Lorica segmentata you linked is okay, but Romans also used other types of armour in that period of yours. Like mail armour (called inaccurately "chain mail" by many), lorica hamata:
http://deepeeka.in/products-catalog/armo...amata.html
And scale armour, lorica squamata. But these too are nowadays more expensive to buy.

Helmet
The first helmet you linked is the infamous "Roman trooper helmet", avoid that like a plague!!! It is by far the most hated helmet on the market, for several reasons. It is of bad quality, it has numerous flaws, it is totally non historically accurate, and doesn't even fit on most people's heads.

Please buy some of these instead, I give you several examples of better helmets made by Deepeeka, so they are relatively cheap (a few more expensive though), but much more authentic and accurate. There were many different helmet types used by the Romans in the period you describe, and older helmets were frequently passed down from father to son, since they lasted more than a lifetime. So an older helmet is not an anachronism, but a later obviously is.

Imperial Gallic types were developed a bit earlier than Imperial Italic types, at least the first examples of them, but both developed into many different forms during time.

Imperial Gallic A
http://deepeeka.in/products-catalog/armo...lic-a.html

Imperial Gallic B
http://deepeeka.in/products-catalog/armo...lic-b.html

Imperial Gallic C
http://deepeeka.in/products-catalog/armo...c-new.html

Imperial Gallic F
http://deepeeka.in/products-catalog/armo...ancon.html (Besancon type)
http://deepeeka.in/products-catalog/armo...sisak.html (Sisak type)

Imperial Gallic G
http://deepeeka.in/products-catalog/armo...lic-g.html (the most popular helmet among re-enactors)
http://deepeeka.in/products-catalog/armo...worms.html (Worms type)

Imperial Gallic H
http://deepeeka.in/products-catalog/armo...lic-h.html

Imperial Gallic T
http://deepeeka.in/products-catalog/armo...mainz.html

Aquincum helmet
http://deepeeka.in/products-catalog/armo...s-new.html

Gallic G with transverse crest (helmet for Centurion)
http://deepeeka.in/products-catalog/armo...urion.html

Imperial Italic types

Imperial Italic B:
http://deepeeka.in/products-catalog/armo...lic-b.html

Imperial Italic C
http://deepeeka.in/products-catalog/armo...lic-c.html

Imperial Italic D
http://deepeeka.in/products-catalog/armo...lic-d.html

Imperial Italic G
http://deepeeka.in/products-catalog/armo...lic-g.html

Krefeld helmet
http://deepeeka.in/products-catalog/armo...elmet.html

Niedermörmter helmets
http://deepeeka.in/products-catalog/armo...rmter.html
http://deepeeka.in/products-catalog/armo...s-new.html

There were just one Centurion helmet option, which is accurate, but a separate crests can be bought from many sites. The ones with wooden crest boxes (the thing from where the horse hair or feathers spring out) are usually better than the metallic ones. It's also easy to make yourself. Take a piece of wood and saw it to the arced shape, drill some holes on the upper side and glue some feathers on. Feathers were as used or maybe even more used than horsehair for crests in Imperial period.


Shield
As others have states before, it is possible to make a shield by yourself, which is more authentic and cheaper or course. The one you linked is quite frankly horrible, maybe it's partly due because of the paintjob, why is it that the larp latex things have to be painted with deep shadows in every edge? It is not realistic looking, just "toyish".


Sword
The first sword you linked looks horrible and nothing like a Roman gladius. The latter is better, but even better would be some which would have staright edged blade, since that leaf shaped blade model (Mainz type, which the latter sword poorly represents) was quite old in the time period of your choosing and probably not in use anymore. The newer Pompeii type gladius would be better (the one with straight edged blade). The guard and pommel should also be made of wood and not metal (imitation metal in this case) and the grip from horn, but they can be painted brown and off-white respectively, when we're talking about a latex sword.

Sandals
Those are not very accurate at all, so I'll find some better for you:
http://deepeeka.in/roman-caligae.html

Tunic
Tunics are the easiest to make yourself. Just a large rectangular piece of wool or linen is needed. Avoid cotton, since it wasn't used back then. Fold it half, sew the sides together but leave some room for hands and make a hole for the head. That's it. Roman tunics usually didn't have sleeves, but they were so wide that they looked like having sleeves when worn with a belt. The tunic fabric should go from elbow to elbow when you hold your hands straight to left and right. It should reach a bit below your knee but it is worn with a belt to gather the fabric a bit, so the lower hem is above the knee. Red, white, off-white, brown, yellow, green and blue would all be good colours to choose from. Red is the most (over)used by re-enactors for obvious reasons: everyone associates that colour (and only that colous) with Romans. Do not use black (the colour of grief, sorrow and ill omens) or purple (the colour of emperors and nobility).

Belt
Belt can be made by yourself, instructions might be found on this forum or elsewhere on the internet.

Subarmalis
The subarmalis you listed is good, go for it.

Neck scarf
Neck scarf, focale in Latin is something else you also need. It is a long and narrow piece of wool (like modern neck scarfs used in winter) worn around neck, and partially under armour to prevent the armour from chafing your neck. It is authentic and important, otherwise your neck will start to hurt at some point from the plates of the armour. This is also easy to make yourself from a piece of wool. If you have red tunics, for example blue focales could look strikingly cool.

* * *

All links I listed are for Deepeeka products, but I picked them since they are not the most expensive in the market, and relatively accurate (but Deepeeka has many many horribly inaccurate things for sale also, so be aware of them). Better things can be found, but they are generally more expensive.

Here's also a useful (though not very pretty looking) webpage for where to buy things:
http://www.larp.com/legioxx/supplrs.html

And a list of things to avoid:
http://www.larp.com/legioxx/bad.html

P.S.
It would also be good not to have everyone wearing all the same equipment, since armamanet wasn't that standardised back in the Roman times, and uniforms as we have now, didn't exist. Every soldier had an armour, helmet, tunic, shield, sandals etc. but the types may have varied a lot. Maybe different helmet types for a few people would be good. And different coloured subarmales etc.